Body language is a form of non-verbal communication, which consists of body posture, gestures, facial expressions, and eye movements. Humans send and interpret such signals almost entirely subconsciously.

Body language is the unspoken or non-verbal mode of communication that we use in every single aspect of our interaction with another person. It is like a mirror that tells us what the other person thinks and feels in response to our words or actions. 55% of the messages that we convey to other people are transmitted through body language. The actual verbal communication accounts for the other 38% in tone of voice and only 7% in the words we use (*When verbal context is ambiguous).

Body language may provide clues as to the attitude or state of mind of a person. For example, it may indicate aggression, attentiveness, boredom, relaxed state, pleasure, amusement, and intoxication, among many other cues.

Click here for information on the first online Micro Expressions & Body Language 101 interactive 8-Module Online Course. Learn how to detect lies, how to read body language, and how to read micro expressions.

Guideline to Catching Liars by Examining Nonverbal and Verbal Behaviour - Observational Guidelines (8): Pay attention to deviations from a person's honest reactions in similar situations: the comparable truth.
Take into account personal differences when making judgments to avoid the Brokaw Hazard (the possibility of misjudging people's idiosyncrasies as deceit). In other words, obtain a baseline under similar conditions where the truth was told in order to make an assessment of any behaviour that differs; the comparable truth. Be aware of the Othello Error (a truthful subject fearing being disbelieved) and take into account situational stressors.